They planted trees on__side of the playground.A.either B.each C.all D.every
问题描述：
They planted trees on__side of the playground.A.either B.each C.all D.every
答
选B 首先一般操场都是有四边的,排除A.side后没有s,排除C.each和every相比,each更强调个体,如：She kept a card index for each child.你可以自己体会一下哦~